Spearhead base



FIG. 1 is a perspective view of a spearhead base showing our new design;

FIG. 2 is another perspective view of the spearhead base shown in FIG. 1;

FIG. 3 is a front elevational view of the spearhead base shown in FIG. 1, the rear view being identical thereto;

FIG. 4 is a right side elevational view of the spearhead base shown in FIG. 1, the left side view being identical thereto; and,

FIG. 5 is a bottom plan view of the spearhead base shown in FIG. 1.

The phantom, broken lines shown in the drawings form part of the design that is not claimed herein. 

The ornamental design for a spearhead base, as shown and described. 